Усилители для пропорциональных клапанов регулирования расхода VT-VRPA1-150-1X

Description Component series 1X Analog, Euro-card format For valves: 2FRE 6 Features Differential input, switchable from voltage to current input Two non-isolated command value inputs Enable input and "ramp off" input Amplitude, zero point and adjustable ramp time Reverse polarity protection for the operating voltage Outputs for command value and actual value LED display for "ready for operation" Product description Limitation and position controller From the output of the ramp generator [3], the command value voltage reaches the "Gw" potentiometer which is accessible through the front plate and serves as attenuator. It can also be used to set the maximum flow of the valve. The downstream limiter [7] limits the command value to 105 % or –5 % (e.g. at excessive command value voltage or by adjustment of the potentiometer for zero point "Zw" and basic value "Gw") to prevent the valve spool from hitting the mechanical end positions. The output signal of the limiter [7] is the position command value which is supplied to the PID controllers [8] and via an output stage [17] also to measuring socket "w" on the front plate of the card as well as to port 28c at the connector strip X1 (command value after ramp and limiter). A voltage of +6 V at command value measuring socket "w" corresponds to a command value of +100 %. The PID controller has been especially optimized for DBETR and FRE valves. In the controller, the position command value and the actual position value are compared; in case of a difference, a corresponding control output is forwarded to the current output stage [13] the output signal of which controls the proportional solenoid of valve. Position sensing The position transducer electronics consist of an oscillator [14] with downstream driver [15] for controlling the inductive position transducer and a demodulator [16] for analyzing the position transducer signal (actual value). The oscillator frequency is approx. 2.5 kHz. The inductive position transducer must be connected as throttle circuit with mid sensing. The position transducer electronics have been adjusted at the factory. Very long or capacitive position transducer lines may require readjustment of the zero point (via potentiometer "Zx"). The actual value (corresponds to the valve spool position) can be measured at the actual value measuring socket. Notice: The actual value signal is output in inverted form as compared to the command value. A path of 100 % corresponds to –6 V at the actual value measuring socket and at port 32a of the connector strip X1. Enable input With a signal of > 10 V at enable input 20a, the output stage and I controller are enabled (indication by the yellow LED at the front plate). By setting jumper X3, these are independently and permanently enabled by the signal at the enable input. The switching input will then be ineffective. [ ] = Assignment to the block diagram When using an external time potentiometer, the internal potentiometers for the ramp times must